/**
 * @author Martin Karkowski
 * @email m.karkowski@zema.de
 * @create date 2020-10-12 17:25:30
 * @modify date 2020-10-12 17:55:40
 * @desc [description]
 */

import { callOptions, externalEvent } from "./Interface.CommunicationInterface";
import { INopeObservable, pipe } from "./Interface.nopeObservebale";

/**
 * A Dispatcher to perform a function on a Remote 
 * Dispatcher. Therefore a Task is created and forwarded
 * to the remote.
 *
 * @export
 * @class INopeDispatcher
 */
export interface INopeDispatcher {

    readonly id: string;

    methodInterfaceWithOptions: { [index: string]: <T>(optins: callOptions, ...args) => Promise<T> }
    methodInterface: { [index: string]: <T>(...args) => Promise<T> }

    /**
     * Function to test if a specific Service exists.
     *
     * @param {string} id The Id of the Serivce
     * @return {boolean} The result of the Test. True if either local or remotly a service is known. 
     * @memberof INopeDispatcher
     */
    serviceExists(id: string): boolean;

    subscriptionExists(topic: string): boolean;

    /**
     * Function to register a Function in the Dispatcher
     *
     * @param {(...args) => Promise<any>} func The function which should be called if a request is mapped to the Function.
     * @param {{
     *     // Flag to enable unregistering the function after calling.
     *     deleteAfterCalling?: boolean,
     *     // Instead of generating a uuid an id could be provided
     *     id?: string;
     *   }} [options={}] Options to enhance the registered ID and enabling unregistering the Element after calling it.
     * @return {*} {(...args) => Promise<any>} The registered Function
     * @memberof INopeDispatcher
     */
    registerFunction(func: (...args) => Promise<any>, options?: {
        /** Flag to enable unregistering the function after calling. */
        deleteAfterCalling?: boolean,
        /** Instead of generating a uuid an id could be provided */
        id?: string;
        /** Flag to enable / disable sending to registery */
        preventSendingToRegistery?: boolean;
    }): (...args) => Promise<any>

    /**
     * Function to unregister a Function from the Dispatcher
     * @param {(((...args) => void) | string | number)} func The Function to unregister
     * @return {*} {boolean} Flag, whether the element was removed (only if found) or not.
     * @memberof INopeDispatcher
     */
    unregistFunction(func: ((...args) => void) | string, options?: {
        /** Flag to enable / disable sending to registery */
        preventSendingToRegistery?: boolean;
    }): boolean 

    /**
     * Function to register a Oberservable into the element.
     *
     * @template T
     * @template K
     * @template S
     * @template G
     * @param {nopeObservable<T,S,G>} observable
     * @param {({
     *     mode: 'subscribe' | 'publish' | Array<'subscribe' | 'publish'>,
     *     topic: string | {
     *         subscribe?: string,
     *         publish?: string,
     *     },
     *     pipe?:{
     *       pipe?: pipe<externalEvent,K>,
     *       scope?: { [index: string]: any }
     *     },
     *     preventSendingToRegistery?: boolean
     *   })} options
     * @return {*}  {INopeObservable<T, S, G>}
     * @memberof INopeDispatcher
     */
    registerObservable<T, K, S = T, G = T>(observable: INopeObservable<T, S, G>, options: {
        mode: 'subscribe' | 'publish' | Array<'subscribe' | 'publish'>,
        topic: string | {
            subscribe?: string,
            publish?: string,
        },
        pipe?: {
            pipe?: pipe<externalEvent, K>,
            scope?: { [index: string]: any }
        },
        preventSendingToRegistery?: boolean
    }): INopeObservable<T, S, G>;

    /**
     * Function to unregister a Function from the Dispatcher
     * @param {(((...args) => void) | string | number)} func The Function to unregister
     * @return {*} {boolean} Flag, whether the element was removed (only if found) or not.
     * @memberof INopeDispatcher
     */
    unregistObservable(observable: INopeObservable<any>, options?: {
        /** Flag to enable / disable sending to registery */
        preventSendingToRegistery?: boolean;
    }): boolean 

    /**
     * Function which is used to perform a call on the remote.
     *
     * @template T
     * @param {string} functionName The Name / ID of the Function
     * @param {any[]} params The provided Parameters.
     * @param {({
     *     deletableCallbacks: Array<number>;
     *   })} [options={
      *     deletableCallbacks: [],
      *     paramsHasNoCallback: false,
      *     preventErrorTest: false
      *   }] You could additiona Optionf for the callback.
     * @return {*} {Promise<T>} The result of the Operation
     * @memberof INopeDispatcher
     */
    performCall<T>(functionName: string, params: any[], options?: Partial<callOptions>): Promise<T>

    /**
     * Function to clear all pending tasks
     *
     * @memberof INopeDispatcher
     */
    clearTasks(): void

    /**
     * Function to unregister all Functions of the Dispatcher.
     *
     * @memberof INopeDispatcher
     */
    unregisterAll(): void

    /**
     * Function to reset the Dispatcher.
     *
     * @memberof INopeDispatcher
     */
    reset(): void
}